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Cheap flights from Portland, Maine to London from $380

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to London departing on 10/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Portland, Maine to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
2:53 pm - 10:20 am
PWM
-
LHR
14h 27m
1 stop
Delta Logo
9:55 am - 12:59 am
LHR
-
PWM
20h 04m
2 stops
$898Delta
Tue, Aug 18 - Thu, Aug 27
Delta Logo
4:47 pm - 1:15 pm
PWM
-
LHR
15h 28m
2 stops
Delta Logo
9:55 am - 12:59 am
LHR
-
PWM
20h 04m
2 stops
$903Delta
Tue, Aug 18 - Thu, Aug 27
JetBlue Logo
1:17 pm - 9:30 am
PWM
-
LHR
15h 13m
1 stop
JetBlue Logo
11:55 am - 12:14 am
LHR
-
PWM
17h 19m
1 stop
$910JetBlue
Tue, Aug 18 - Thu, Aug 27
JetBlue Logo
6:00 am - 9:30 am
PWM
-
LHR
22h 30m
1 stop
JetBlue Logo
11:55 am - 1:45 pm
LHR
-
PWM
30h 50m
1 stop
$935JetBlue
Sun, Aug 23 - Tue, Aug 25
United Airlines Logo
6:53 pm - 10:25 am
PWM
-
LHR
10h 32m
1 stop
United Airlines Logo
6:50 am - 6:29 pm
LHR
-
PWM
16h 39m
2 stops
$973United Airlines
Sun, Aug 23 - Tue, Aug 25
JetBlue Logo
2:40 pm - 8:45 pm
PWM
-
LHR
25h 05m
1 stop
JetBlue Logo
8:15 am - 12:16 am
LHR
-
PWM
21h 01m
1 stop
$1,005JetBlue
Fri, Jul 17 - Fri, Jul 24
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 12:16 am
LHR
-
PWM
21h 01m
1 stop
$1,007JetBlue
Thu, Jul 16 - Thu, Jul 23
United Airlines Logo
7:35 pm - 2:40 pm
PWM
-
LHR
14h 05m
2 stops
United Airlines Logo
2:05 pm - 11:32 pm
LHR
-
PWM
14h 27m
2 stops
$1,008United Airlines
Sun, Aug 23 - Tue, Aug 25
JetBlue Logo
6:00 am - 9:30 am
PWM
-
LHR
22h 30m
1 stop
JetBlue Logo
11:55 am - 12:14 am
LHR
-
PWM
17h 19m
1 stop
$1,022JetBlue
Sun, Aug 9 - Sat, Aug 15
JetBlue Logo
2:30 pm - 9:30 am
PWM
-
LHR
14h 00m
1 stop
JetBlue Logo
8:15 am - 12:16 am
LHR
-
PWM
21h 01m
1 stop
$1,035JetBlue
Sat, Jul 4 - Fri, Jul 10

JetBlue flights from Portland, Maine to London Heathrow Airport

Our best JetBlue deals on Portland, Maine to London Heathrow Airport flight tickets
JetBlue
Nov 10
PWM6:30 amPortland
22h 00m
1 stop
LHR9:30 amLondon Heathrow
Nov 17
LHR7:25 amLondon Heathrow
21h 18m
1 stop
PWM11:43 pmPortland
$893
JetBlue
Aug 18
PWM1:17 pmPortland
15h 13m
1 stop
LHR9:30 amLondon Heathrow
Aug 27
LHR11:55 amLondon Heathrow
17h 19m
1 stop
PWM12:14 amPortland
$910
JetBlue
Sep 17
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
Sep 24
LHR8:15 amLondon Heathrow
20h 37m
1 stop
PWM11:52 pmPortland
$914

KLM flights from Portland, Maine to London Heathrow Airport

Our best KLM deals on Portland, Maine to London Heathrow Airport flight tickets
KLM
Nov 10
PWM2:35 pmPortland
12h 30m
1 stop
LHR8:05 amLondon Heathrow
Nov 17
LHR10:45 amLondon Heathrow
16h 38m
1 stop
PWM10:23 pmPortland
$897
KLM
Sep 18
PWM2:35 pmPortland
14h 45m
1 stop
LHR10:20 amLondon Heathrow
Sep 25
LHR11:45 amLondon Heathrow
17h 14m
1 stop
PWM11:59 pmPortland
$916
KLM
Sep 10
PWM2:35 pmPortland
13h 15m
1 stop
LHR8:50 amLondon Heathrow
Sep 15
LHR12:50 pmLondon Heathrow
16h 09m
1 stop
PWM11:59 pmPortland
$917

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to London Heathrow Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 7, 2026.
Use the filters below to find and compare flights from Portland, Maine to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 8/18

2:53 pm-10:20 am

1 stop14h 27m

London Heathrow

Thu 8/27

9:55 am-12:59 am

2 stops20h 04m

$898

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 8/18

4:47 pm-1:15 pm

2 stops15h 28m

London Heathrow

Thu 8/27

9:55 am-12:59 am

2 stops20h 04m

$903

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 8/18

1:17 pm-9:30 am

1 stop15h 13m

London Heathrow

Thu 8/27

11:55 am-12:14 am

1 stop17h 19m

$910

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 8/23

6:00 am-9:30 am

1 stop22h 30m

London Heathrow

Tue 8/25

11:55 am-1:45 pm

1 stop30h 50m

$935
Quickest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 8/23

6:53 pm-10:25 am

1 stop10h 32m

London Heathrow

Tue 8/25

6:50 am-6:29 pm

2 stops16h 39m

$973

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 7/17

2:40 pm-8:45 pm

1 stop25h 05m

London Heathrow

Fri 7/24

8:15 am-12:16 am

1 stop21h 01m

$1,005

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 7/16

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Thu 7/23

8:15 am-12:16 am

1 stop21h 01m

$1,007

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 8/23

7:35 pm-2:40 pm

2 stops14h 05m

London Heathrow

Tue 8/25

2:05 pm-11:32 pm

2 stops14h 27m

$1,008

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 8/9

6:00 am-9:30 am

1 stop22h 30m

London Heathrow

Sat 8/15

11:55 am-12:14 am

1 stop17h 19m

$1,022

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 7/4

2:30 pm-9:30 am

1 stop14h 00m

London Heathrow

Fri 7/10

8:15 am-12:16 am

1 stop21h 01m

$1,035

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Portland, Maine to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Portland to London Heathrow?

United Airlines, Air Canada, and Scandinavian Airlines are the most popular carriers operating from Portland to London Heathrow

What airlines fly to London Heathrow Airport?

British Airways, Delta and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Portland, Maine according to our data. British Airways is the first choice among our users, with 48% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 16 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

When to book flights from Portland, Maine to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland, Maine to London Heathrow Airport (PWM to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to London Heathrow Airport

Fastest flight time

9h 45m

Direct flights

None
The fastest flight from Portland, Maine to London Heathrow Airport takes 9h 45m
There are no direct flights from Portland, Maine to London Heathrow Airport. There are no popular flight routes from Portland, Maine to London Heathrow Airport.
Search flight deals

Frequently asked questions about flying from Portland, Maine to London Heathrow Airport

  • How far is Portland to London Heathrow by plane?

    The distance between Portland and London Heathrow is about 3170.3 mi. In terms of flight time, this usually takes a little over 9h 45m.

  • When did momondo last update prices for flights from Portland Airport to London Heathrow Airport?

    Prices for flights from Portland Airport to London Heathrow Airport refresh daily.

  • How old do you have to be to fly from Portland Airport to London Heathrow Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Dover
Hayes
Crawley
Croydon
Wembley
Stratford-upon-Avon
Stansted
Slough
Harrow
Brentwood
Watford
Cobham
Guildford
Folkestone
Uxbridge
Romford

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Portland with this policy.

How can momondo help me find flights from Portland to London?

Once you have performed a search for Portland to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Portland and alert you when they change.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
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